【单选题】If with one hour of labor time nation A can produce either 3X or 3Y while nation B can produce either 1X or 3Y (and labor is the only input): a. nation A has a comparative disadvantage in commodity X
A.
a. nation A has a comparative disadvantage in commodity X
B.
b. nation B has a comparative disadvantage in commodity Y
C.
c. nation A has a comparative advantage in commodity X
D.
d. nation A has a comparative advantage in neither commodity
【简答题】Listen to the passage and fill out the outline. (within 3 words for each blank) Overcrowded Cities I. Problem a) __________ leading to an increase in 2.________, _3.________ and crime II. Cause a) 4. ...